/* ============================================
   女神视频 - 珠宝首饰鉴定与拍卖视频平台
   CSS前缀: zb2- (ZhuBao 2)
   设计风格: 珠宝展柜璀璨风
   ============================================ */

/* === Google Fonts 本地化替代 === */
@font-face {
  font-family: 'ZB2Serif';
  src: local('Playfair Display'), local('Georgia'), local('Times New Roman');
  font-display: swap;
}
@font-face {
  font-family: 'ZB2Sans';
  src: local('Lato'), local('Helvetica Neue'), local('Arial');
  font-display: swap;
}

/* === CSS变量 === */
:root {
  --zb2-white: #FFFFFF;
  --zb2-light-gray: #F0F0F0;
  --zb2-sapphire: #0F52BA;
  --zb2-sapphire-dark: #0A3D8F;
  --zb2-champagne: #F7E7CE;
  --zb2-champagne-dark: #E8D4B0;
  --zb2-text-dark: #1A1A2E;
  --zb2-text-medium: #4A4A5A;
  --zb2-text-light: #7A7A8A;
  --zb2-border: #E0E0E0;
  --zb2-gold: #C9A96E;
  --zb2-gold-light: #D4B87A;
  --zb2-shadow: rgba(15, 82, 186, 0.08);
  --zb2-font-serif: 'ZB2Serif', 'Playfair Display', 'Georgia', 'Noto Serif SC', serif;
  --zb2-font-sans: 'ZB2Sans', 'Lato', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --zb2-max-width: 1440px;
  --zb2-content-width: 1200px;
  --zb2-transition: all 0.3s ease;
}

/* === 全局重置 === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--zb2-font-sans);
  color: var(--zb2-text-dark);
  background-color: var(--zb2-white);
  line-height: 1.8;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--zb2-sapphire);
  text-decoration: none;
  transition: var(--zb2-transition);
}

a:hover {
  color: var(--zb2-sapphire-dark);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--zb2-font-serif);
  color: var(--zb2-text-dark);
  line-height: 1.4;
  margin-bottom: 0.8em;
}

h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.4rem; }

p {
  margin-bottom: 1.2em;
  color: var(--zb2-text-medium);
}

/* === 容器 === */
.zb2-container {
  width: 100%;
  max-width: var(--zb2-content-width);
  margin: 0 auto;
  padding: 0 20px;
}

.zb2-section {
  padding: 80px 0;
}

.zb2-section-alt {
  background-color: var(--zb2-light-gray);
}

.zb2-section-title {
  text-align: center;
  margin-bottom: 50px;
  position: relative;
}

.zb2-section-title h2 {
  display: inline-block;
  position: relative;
  padding-bottom: 15px;
}

.zb2-section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--zb2-champagne), var(--zb2-sapphire), var(--zb2-champagne));
}

.zb2-section-title p {
  color: var(--zb2-text-light);
  font-size: 1rem;
  margin-top: 10px;
}

/* === 导航栏 === */
.zb2-header {
  background-color: var(--zb2-white);
  border-bottom: 1px solid var(--zb2-sapphire);
  position: relative;
  z-index: 100;
}

.zb2-nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 20px;
  max-width: var(--zb2-max-width);
  margin: 0 auto;
}

.zb2-logo {
  font-family: var(--zb2-font-serif);
  font-size: 1.5rem;
  color: var(--zb2-sapphire);
  font-weight: 700;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.zb2-logo img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.zb2-nav-menu {
  display: flex;
  list-style: none;
  gap: 5px;
  align-items: center;
}

.zb2-nav-link {
  font-family: var(--zb2-font-serif);
  font-size: 0.95rem;
  color: var(--zb2-text-dark);
  padding: 8px 14px;
  border-radius: 4px;
  transition: var(--zb2-transition);
  white-space: nowrap;
}

.zb2-nav-link:hover,
.zb2-nav-link.zb2-active {
  color: var(--zb2-sapphire);
  background-color: rgba(15, 82, 186, 0.05);
}

.zb2-nav-right {
  display: flex;
  align-items: center;
  gap: 15px;
}

.zb2-search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--zb2-border);
  border-radius: 20px;
  padding: 5px 15px;
  background: var(--zb2-light-gray);
}

.zb2-search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.85rem;
  width: 120px;
  font-family: var(--zb2-font-sans);
}

.zb2-search-box button {
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--zb2-sapphire);
  font-size: 1rem;
}

.zb2-member-btn {
  font-family: var(--zb2-font-serif);
  font-size: 0.85rem;
  color: var(--zb2-white);
  background: var(--zb2-sapphire);
  padding: 8px 18px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  transition: var(--zb2-transition);
  white-space: nowrap;
}

.zb2-member-btn:hover {
  background: var(--zb2-sapphire-dark);
  color: var(--zb2-white);
}

/* 汉堡菜单 */
.zb2-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
  background: none;
  border: none;
}

.zb2-hamburger span {
  width: 25px;
  height: 2px;
  background-color: var(--zb2-text-dark);
  transition: var(--zb2-transition);
}

/* === Hero Banner === */
.zb2-hero {
  position: relative;
  height: 90vh;
  min-height: 500px;
  overflow: hidden;
  background-color: var(--zb2-light-gray);
}

.zb2-hero-slider {
  position: relative;
  width: 100%;
  height: 100%;
}

.zb2-hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.zb2-hero-slide.zb2-slide-active {
  opacity: 1;
}

.zb2-hero-slide img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.zb2-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.2) 100%);
}

.zb2-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--zb2-white);
  padding: 0 20px;
  max-width: 800px;
}

.zb2-hero-content h2 {
  font-size: 3rem;
  color: var(--zb2-white);
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
  margin-bottom: 15px;
  letter-spacing: 2px;
}

.zb2-hero-content p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 30px;
  font-family: var(--zb2-font-serif);
}

.zb2-hero-btn {
  display: inline-block;
  padding: 14px 40px;
  border: 2px solid var(--zb2-champagne);
  color: var(--zb2-champagne);
  font-family: var(--zb2-font-serif);
  font-size: 1rem;
  letter-spacing: 3px;
  transition: var(--zb2-transition);
  text-transform: uppercase;
}

.zb2-hero-btn:hover {
  background-color: var(--zb2-champagne);
  color: var(--zb2-text-dark);
}

.zb2-hero-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 3;
}

.zb2-hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--zb2-champagne);
  background: transparent;
  cursor: pointer;
  transition: var(--zb2-transition);
}

.zb2-hero-dot.zb2-dot-active {
  background: var(--zb2-champagne);
}

/* === 视频区域 === */
.zb2-video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.zb2-video-card {
  background: var(--zb2-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--zb2-shadow);
  transition: var(--zb2-transition);
  cursor: pointer;
}

.zb2-video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(15, 82, 186, 0.15);
}

.zb2-video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.zb2-video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.zb2-video-card:hover .zb2-video-thumb img {
  transform: scale(1.05);
}

.zb2-video-play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(15, 82, 186, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--zb2-transition);
}

.zb2-video-play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent white;
  margin-left: 4px;
}

.zb2-video-card:hover .zb2-video-play-icon {
  background: rgba(15, 82, 186, 1);
  transform: translate(-50%, -50%) scale(1.1);
}

.zb2-video-info {
  padding: 20px;
}

.zb2-video-info h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.zb2-video-info p {
  font-size: 0.85rem;
  color: var(--zb2-text-light);
  margin-bottom: 0;
}

/* === 视频模态框 === */
#zb2-video-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

#zb2-video-modal.zb2-modal-open {
  display: flex;
}

.zb2-modal-content {
  position: relative;
  width: 90%;
  max-width: 900px;
}

.zb2-modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--zb2-font-sans);
  transition: var(--zb2-transition);
}

.zb2-modal-close:hover {
  color: var(--zb2-champagne);
}

.zb2-video-player {
  width: 100%;
  border-radius: 8px;
  background: #000;
}

/* === 拍卖预告 === */
.zb2-auction-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.zb2-auction-card {
  background: var(--zb2-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--zb2-shadow);
  transition: var(--zb2-transition);
}

.zb2-auction-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(15, 82, 186, 0.12);
}

.zb2-auction-img {
  aspect-ratio: 4/3;
  overflow: hidden;
}

.zb2-auction-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.zb2-auction-card:hover .zb2-auction-img img {
  transform: scale(1.05);
}

.zb2-auction-body {
  padding: 25px;
}

.zb2-auction-body h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.zb2-auction-price {
  font-family: var(--zb2-font-serif);
  font-size: 1.2rem;
  color: var(--zb2-sapphire);
  font-weight: 700;
  margin-bottom: 12px;
}

.zb2-countdown {
  display: flex;
  gap: 8px;
}

.zb2-countdown-item {
  background: var(--zb2-light-gray);
  padding: 6px 10px;
  border-radius: 4px;
  text-align: center;
  min-width: 45px;
}

.zb2-countdown-num {
  display: block;
  font-family: var(--zb2-font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--zb2-sapphire);
}

.zb2-countdown-label {
  font-size: 0.7rem;
  color: var(--zb2-text-light);
}

/* === 知识讲堂 === */
.zb2-knowledge-list {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.zb2-knowledge-item {
  display: flex;
  gap: 30px;
  background: var(--zb2-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--zb2-shadow);
  transition: var(--zb2-transition);
}

.zb2-knowledge-item:hover {
  box-shadow: 0 8px 30px rgba(15, 82, 186, 0.12);
}

.zb2-knowledge-img {
  flex: 0 0 300px;
  overflow: hidden;
}

.zb2-knowledge-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 200px;
}

.zb2-knowledge-text {
  flex: 1;
  padding: 25px 25px 25px 0;
}

.zb2-knowledge-text h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.zb2-knowledge-text p {
  font-size: 0.92rem;
  line-height: 1.8;
}

.zb2-read-more {
  display: inline-block;
  font-family: var(--zb2-font-serif);
  font-size: 0.9rem;
  color: var(--zb2-sapphire);
  border-bottom: 1px solid var(--zb2-sapphire);
  padding-bottom: 2px;
  transition: var(--zb2-transition);
}

.zb2-read-more:hover {
  color: var(--zb2-sapphire-dark);
  border-color: var(--zb2-sapphire-dark);
}

/* === 设计师专访 === */
.zb2-designer-feature {
  display: flex;
  gap: 50px;
  align-items: center;
}

.zb2-designer-img {
  flex: 0 0 400px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 8px 30px var(--zb2-shadow);
}

.zb2-designer-img img {
  width: 100%;
  height: auto;
}

.zb2-designer-text {
  flex: 1;
}

.zb2-designer-text blockquote {
  font-family: var(--zb2-font-serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--zb2-text-medium);
  border-left: 3px solid var(--zb2-sapphire);
  padding-left: 20px;
  margin: 20px 0;
  line-height: 1.8;
}

/* === CTA 在线估价 === */
.zb2-cta-section {
  background: linear-gradient(135deg, var(--zb2-sapphire) 0%, var(--zb2-sapphire-dark) 100%);
  padding: 80px 0;
  text-align: center;
}

.zb2-cta-section h2 {
  color: var(--zb2-white);
  font-size: 2.2rem;
  margin-bottom: 15px;
}

.zb2-cta-section p {
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 30px;
}

.zb2-cta-btn {
  display: inline-block;
  padding: 16px 50px;
  background: var(--zb2-champagne);
  color: var(--zb2-text-dark);
  font-family: var(--zb2-font-serif);
  font-size: 1.1rem;
  border-radius: 4px;
  letter-spacing: 2px;
  transition: var(--zb2-transition);
  border: none;
  cursor: pointer;
}

.zb2-cta-btn:hover {
  background: var(--zb2-champagne-dark);
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  color: var(--zb2-text-dark);
}

/* === 品牌故事 === */
.zb2-brand-story {
  display: flex;
  gap: 50px;
  align-items: center;
}

.zb2-brand-img {
  flex: 0 0 500px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 8px 30px var(--zb2-shadow);
}

.zb2-brand-img img {
  width: 100%;
  height: auto;
}

.zb2-brand-text {
  flex: 1;
}

.zb2-brand-text p {
  font-size: 1rem;
  line-height: 2;
}

/* === 展讯时间线 === */
.zb2-timeline {
  position: relative;
  padding-left: 40px;
}

.zb2-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--zb2-sapphire), var(--zb2-champagne));
}

.zb2-timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 30px;
}

.zb2-timeline-item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--zb2-sapphire);
  border: 3px solid var(--zb2-white);
  box-shadow: 0 0 0 2px var(--zb2-sapphire);
}

.zb2-timeline-date {
  font-family: var(--zb2-font-serif);
  font-size: 0.9rem;
  color: var(--zb2-sapphire);
  font-weight: 700;
  margin-bottom: 5px;
}

.zb2-timeline-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.zb2-timeline-item p {
  font-size: 0.92rem;
}

/* === 页脚 === */
.zb2-footer {
  background: var(--zb2-text-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.zb2-footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.zb2-footer-col h4 {
  font-family: var(--zb2-font-serif);
  color: var(--zb2-champagne);
  font-size: 1.1rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.zb2-footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--zb2-sapphire);
}

.zb2-footer-col p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.8;
}

.zb2-footer-col ul {
  list-style: none;
}

.zb2-footer-col ul li {
  margin-bottom: 10px;
}

.zb2-footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: var(--zb2-transition);
}

.zb2-footer-col ul li a:hover {
  color: var(--zb2-champagne);
}

.zb2-footer-honors {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 30px 0;
}

.zb2-honor-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-bottom: 20px;
}

.zb2-honor-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}

.zb2-honor-icon {
  font-size: 1.2rem;
}

.zb2-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
}

.zb2-footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  margin-bottom: 5px;
}

.zb2-auth-number {
  font-family: var(--zb2-font-serif);
  font-size: 0.85rem;
  color: var(--zb2-champagne);
  letter-spacing: 1px;
}

/* === 面包屑 === */
.zb2-breadcrumb {
  padding: 15px 0;
  font-size: 0.85rem;
}

.zb2-breadcrumb a {
  color: var(--zb2-text-light);
}

.zb2-breadcrumb a:hover {
  color: var(--zb2-sapphire);
}

.zb2-breadcrumb span {
  color: var(--zb2-text-light);
  margin: 0 8px;
}

/* === 内页通用 === */
.zb2-page-hero {
  background: linear-gradient(135deg, var(--zb2-text-dark) 0%, var(--zb2-sapphire-dark) 100%);
  padding: 60px 0;
  text-align: center;
}

.zb2-page-hero h1 {
  color: var(--zb2-white);
  font-size: 2.2rem;
  margin-bottom: 10px;
}

.zb2-page-hero p {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
}

.zb2-article-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 50px 20px;
}

.zb2-article-content p {
  font-size: 1rem;
  line-height: 2;
  margin-bottom: 1.5em;
  text-align: justify;
}

.zb2-article-content h2 {
  margin-top: 40px;
  margin-bottom: 20px;
}

.zb2-article-content h3 {
  margin-top: 30px;
  margin-bottom: 15px;
}

.zb2-article-img {
  margin: 30px 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--zb2-shadow);
}

/* === 在线估价表单 === */
.zb2-appraisal-steps {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-bottom: 60px;
}

.zb2-step {
  text-align: center;
  position: relative;
}

.zb2-step-num {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--zb2-sapphire);
  color: white;
  font-family: var(--zb2-font-serif);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 15px;
}

.zb2-step h3 {
  font-size: 1rem;
  margin-bottom: 5px;
}

.zb2-step p {
  font-size: 0.85rem;
  color: var(--zb2-text-light);
}

.zb2-form-card {
  max-width: 700px;
  margin: 0 auto;
  background: var(--zb2-white);
  border-radius: 12px;
  padding: 50px;
  box-shadow: 0 8px 40px var(--zb2-shadow);
}

.zb2-form-group {
  margin-bottom: 25px;
}

.zb2-form-group label {
  display: block;
  font-family: var(--zb2-font-serif);
  font-size: 0.95rem;
  color: var(--zb2-text-dark);
  margin-bottom: 8px;
}

.zb2-form-group input,
.zb2-form-group select,
.zb2-form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--zb2-border);
  border-radius: 6px;
  font-family: var(--zb2-font-sans);
  font-size: 0.95rem;
  transition: var(--zb2-transition);
  background: var(--zb2-light-gray);
}

.zb2-form-group input:focus,
.zb2-form-group select:focus,
.zb2-form-group textarea:focus {
  border-color: var(--zb2-sapphire);
  outline: none;
  box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.1);
}

.zb2-form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.zb2-file-upload {
  border: 2px dashed var(--zb2-border);
  border-radius: 8px;
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: var(--zb2-transition);
  background: var(--zb2-light-gray);
}

.zb2-file-upload:hover {
  border-color: var(--zb2-sapphire);
  background: rgba(15, 82, 186, 0.03);
}

.zb2-file-upload p {
  margin-bottom: 0;
  color: var(--zb2-text-light);
}

.zb2-submit-btn {
  width: 100%;
  padding: 16px;
  background: var(--zb2-sapphire);
  color: white;
  border: none;
  border-radius: 6px;
  font-family: var(--zb2-font-serif);
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--zb2-transition);
  letter-spacing: 2px;
}

.zb2-submit-btn:hover {
  background: var(--zb2-sapphire-dark);
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(15, 82, 186, 0.3);
}

/* 模拟分析动画 */
.zb2-analysis-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

.zb2-analysis-overlay.zb2-show {
  display: flex;
}

.zb2-analysis-box {
  background: white;
  border-radius: 12px;
  padding: 50px;
  text-align: center;
  max-width: 400px;
}

.zb2-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--zb2-light-gray);
  border-top: 4px solid var(--zb2-sapphire);
  border-radius: 50%;
  animation: zb2-spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes zb2-spin {
  to { transform: rotate(360deg); }
}

/* === APP下载页 === */
.zb2-app-hero {
  background: linear-gradient(135deg, var(--zb2-text-dark) 0%, #0A1628 100%);
  padding: 100px 0;
  overflow: hidden;
}

.zb2-app-layout {
  display: flex;
  align-items: center;
  gap: 60px;
}

.zb2-app-text {
  flex: 1;
  color: white;
}

.zb2-app-text h2 {
  color: var(--zb2-champagne);
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.zb2-app-text p {
  color: rgba(255,255,255,0.7);
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 30px;
}

.zb2-app-buttons {
  display: flex;
  gap: 20px;
}

.zb2-app-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: 8px;
  font-family: var(--zb2-font-serif);
  font-size: 1rem;
  transition: var(--zb2-transition);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.zb2-app-btn-ios {
  background: linear-gradient(135deg, #333 0%, #1a1a1a 100%);
  color: white;
  border: 1px solid rgba(255,255,255,0.2);
}

.zb2-app-btn-android {
  background: linear-gradient(135deg, var(--zb2-sapphire) 0%, var(--zb2-sapphire-dark) 100%);
  color: white;
}

.zb2-app-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.3);
  color: white;
}

.zb2-app-mockup {
  flex: 0 0 300px;
}

.zb2-app-mockup img {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

/* === 内页视频列表 === */
.zb2-video-list-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

.zb2-video-list-item {
  background: var(--zb2-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--zb2-shadow);
}

/* === 通用卡片 === */
.zb2-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.zb2-card {
  background: var(--zb2-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--zb2-shadow);
  transition: var(--zb2-transition);
}

.zb2-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(15, 82, 186, 0.12);
}

.zb2-card-img {
  aspect-ratio: 4/3;
  overflow: hidden;
}

.zb2-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.zb2-card-body {
  padding: 25px;
}

.zb2-card-body h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.zb2-card-body p {
  font-size: 0.9rem;
  color: var(--zb2-text-light);
}

/* === FAQ 手风琴 === */
.zb2-faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.zb2-faq-item {
  border-bottom: 1px solid var(--zb2-border);
  margin-bottom: 10px;
}

.zb2-faq-question {
  width: 100%;
  padding: 20px 0;
  background: none;
  border: none;
  font-family: var(--zb2-font-serif);
  font-size: 1.05rem;
  color: var(--zb2-text-dark);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--zb2-transition);
}

.zb2-faq-question:hover {
  color: var(--zb2-sapphire);
}

.zb2-faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--zb2-sapphire);
  transition: var(--zb2-transition);
}

.zb2-faq-item.zb2-faq-open .zb2-faq-question::after {
  content: '-';
}

.zb2-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.zb2-faq-answer p {
  padding-bottom: 20px;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ============================================
   响应式断点 (Mobile-First)
   320px -> 768px -> 1024px -> 1440px
   ============================================ */

/* 默认样式为移动端 (320px+) */
@media (max-width: 767px) {
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.1rem; }

  .zb2-nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--zb2-white);
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 30px var(--zb2-shadow);
    border-top: 1px solid var(--zb2-border);
  }

  .zb2-nav-menu.zb2-menu-open {
    display: flex;
  }

  .zb2-hamburger {
    display: flex;
  }

  .zb2-nav-right {
    display: none;
  }

  .zb2-hero {
    height: 70vh;
    min-height: 400px;
  }

  .zb2-hero-content h2 {
    font-size: 1.6rem;
  }

  .zb2-hero-content p {
    font-size: 0.95rem;
  }

  .zb2-video-grid,
  .zb2-auction-grid,
  .zb2-card-grid,
  .zb2-video-list-grid {
    grid-template-columns: 1fr;
  }

  .zb2-knowledge-item {
    flex-direction: column;
  }

  .zb2-knowledge-img {
    flex: none;
  }

  .zb2-knowledge-text {
    padding: 20px;
  }

  .zb2-designer-feature,
  .zb2-brand-story {
    flex-direction: column;
  }

  .zb2-designer-img,
  .zb2-brand-img {
    flex: none;
    width: 100%;
  }

  .zb2-footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .zb2-honor-list {
    flex-direction: column;
    align-items: center;
  }

  .zb2-appraisal-steps {
    flex-direction: column;
    gap: 30px;
  }

  .zb2-form-card {
    padding: 25px;
  }

  .zb2-app-layout {
    flex-direction: column-reverse;
    text-align: center;
  }

  .zb2-app-mockup {
    flex: none;
    width: 200px;
  }

  .zb2-app-buttons {
    justify-content: center;
    flex-wrap: wrap;
  }

  .zb2-page-hero h1 {
    font-size: 1.6rem;
  }

  .zb2-section {
    padding: 50px 0;
  }

  .zb2-cta-section h2 {
    font-size: 1.5rem;
  }
}

/* 平板 (768px+) */
@media (min-width: 768px) and (max-width: 1023px) {
  .zb2-nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--zb2-white);
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 30px var(--zb2-shadow);
  }

  .zb2-nav-menu.zb2-menu-open {
    display: flex;
  }

  .zb2-hamburger {
    display: flex;
  }

  .zb2-video-grid,
  .zb2-auction-grid,
  .zb2-card-grid,
  .zb2-video-list-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .zb2-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .zb2-brand-img,
  .zb2-designer-img {
    flex: 0 0 300px;
  }
}

/* 桌面 (1024px+) */
@media (min-width: 1024px) {
  .zb2-hamburger {
    display: none;
  }

  .zb2-nav-menu {
    display: flex;
  }
}

/* 大屏 (1440px+) */
@media (min-width: 1440px) {
  .zb2-container {
    max-width: 1400px;
  }

  h1 { font-size: 2.8rem; }
  h2 { font-size: 2rem; }

  .zb2-hero-content h2 {
    font-size: 3.5rem;
  }
}

/* === APP展示区域 === */
.zb2-app-showcase {
  display: flex;
  gap: 3rem;
  align-items: center;
}
.zb2-app-mockup {
  flex: 0 0 320px;
}
.zb2-app-mockup img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(15, 82, 186, 0.15);
}
.zb2-app-info {
  flex: 1;
}
.zb2-app-info h2 {
  font-family: var(--zb2-font-serif);
  font-size: 2rem;
  color: var(--zb2-text-dark);
  margin-bottom: 0.5rem;
}
.zb2-app-rating {
  color: var(--zb2-gold);
  font-weight: 600;
  margin-bottom: 1rem;
}
.zb2-app-info > p {
  color: var(--zb2-text-medium);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}
.zb2-app-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.zb2-app-feature {
  background: var(--zb2-light-gray);
  padding: 1.2rem;
  border-radius: 12px;
}
.zb2-app-feature h3 {
  font-size: 1rem;
  color: var(--zb2-sapphire);
  margin-bottom: 0.5rem;
}
.zb2-app-feature p {
  font-size: 0.875rem;
  color: var(--zb2-text-medium);
  line-height: 1.6;
}
.zb2-app-download-btns {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}
.zb2-download-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  text-decoration: none;
  color: var(--zb2-white);
  font-size: 1rem;
  transition: var(--zb2-transition);
}
.zb2-ios-btn {
  background: #000;
}
.zb2-ios-btn:hover {
  background: #333;
}
.zb2-android-btn {
  background: var(--zb2-sapphire);
}
.zb2-android-btn:hover {
  background: var(--zb2-sapphire-dark);
}
.zb2-download-icon {
  font-size: 1.5rem;
}
.zb2-download-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.zb2-download-text small {
  font-size: 0.7rem;
  opacity: 0.8;
}
.zb2-app-note {
  font-size: 0.8rem;
  color: var(--zb2-text-light);
}

@media (max-width: 768px) {
  .zb2-app-showcase {
    flex-direction: column;
    text-align: center;
  }
  .zb2-app-mockup {
    flex: 0 0 auto;
    max-width: 240px;
  }
  .zb2-app-features {
    grid-template-columns: 1fr;
  }
  .zb2-app-download-btns {
    flex-direction: column;
    align-items: center;
  }
  .zb2-download-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}